A084797 Greatest number formed by concatenating prime factors of n in base 10.

1, 2, 3, 22, 5, 32, 7, 222, 33, 52, 11, 322, 13, 72, 53, 2222, 17, 332, 19, 522, 73, 211, 23, 3222, 55, 213, 333, 722, 29, 532, 31, 22222, 311, 217, 75, 3322, 37, 219, 313, 5222, 41, 732, 43, 2211, 533, 232, 47, 32222, 77, 552, 317, 2213, 53, 3332, 511, 7222

Offset: 1

Author

N. J. A. Sloane, Jul 19 2003

Keywords

• nonn
• look
• base

Links

• Alois P. Heinz, Table of n, a(n) for n = 1..20000

Crossrefs

Different from A084796. Cf. A073646.

Programs

Maple

with(combinat):
a:= n-> `if`(n=1, 1, max(map(x-> parse(cat(x[])),
    permute([seq(i[1]$i[2], i=ifactors(n)[2])]))[])):
seq(a(n), n=1..100);  # Alois P. Heinz, May 02 2016

Extensions

More terms from Alois P. Heinz, May 02 2016